This only happens some of the time, on some browsers. For me it happened in Win 7, FF until I was given admin permission.
This user report explains what happens, “Login button for me doesn’t work. The ID Pop up shows, loads, and then
closes, which makes the original window refresh again, but when it does,
I’m not logged in.”
Wondering if anyone has experienced this? I didn’t see any relevant js errors in the console.